- Chinese name
- Policy
- Foreign name
- Navi
- Alias
- HD 5394 、 Cassiopeia gamma
- Classification
- Cassiopeia gamma variable
- Quality
- 19.3 M⊙
- surface temperature
- 25500 K
- Apparent magnitude
- 2.15 to 3.40, etc
- Absolute magnitude
- -4.22 etc
- Right ascension
- 0h56m42.5s [2]
- Declination
- +60°43′0″ [2]
- Distance from ground
- About 610 light years
- Radius
- thirteen point seven R ☉
- Luminosity
- 68,500 L☉
observation data
Policy （ γ Cas / Cassiopeia gamma ）It's the explosion of Cassiopeia Variable star , belonging to 28 nights LegsMansion , one of the main bright stars in the northern sky, whose magnitude varies irregularly between+2.20 and+3.40, is Cassiopeia gamma variable Prototype of. Its name "ce" means "whip", and it has no traditional Arabic or Latin name. It is located in the middle of the W shape of Cassiopeia. Virgil Ivan Grissom, an American astronaut, nicknamed the star "Navi", the inverted form of his middle name. This satellite is often used as a navigation reference that is easy to distinguish in space missions. Policy In 1937, the apparent magnitude was+2.2, in 1940 it was+3.4, in 1949 it was+2.9, in 1965 it was+2.7, and now it is+2.15. When the star is at its brightest, its brightness exceeds that of Cassiopeia α (+2.25) and Cassiopeia β (+2.3).
Policy It is a fast rotating star, protruding at the equator. Together with its high luminosity, it has a huge mass loss and forms a disk ring around the star. Its material outflow and brightness change seem to be caused by the ring.
Policy It's a Spectroscopic binary The detour period is about 204 days, and the eccentricity is from 0.26 to "close to 0". Its companion star is believed to have a mass similar to that of the sun. 
